package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());//转byte数组
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);//使用BeanUtils工具类 其中属性名需要一致
        //设置账号状态,默认正常1，异常为0
        //常量类StatusConstant.ENABLE (状态正常)
        employee.setStatus(StatusConstant.ENABLE);
        //通过常量（constant）引用密码，MD5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        //设置当前记录的创建时间和修改时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
        //设置创建人id和修改人id
        //TODO 后期需要改变当前用户id
            //获取controller中写入内存的id
//        Long currentId = BaseContext.getCurrentId();
//        employee.setCreateUser(currentId);
//        employee.setUpdateUser(currentId);
        employeeMapper.insert(employee);
    }

    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        //开始分页查询
        //页码和每页记录数 --基于localThread 自动继承到employeeMapper的select方法，因为是同一个线程
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        //调用empMapper的pageQuery方法模糊查询姓名
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        long total = page.getTotal();//获取总记录数
        List<Employee> records = page.getResult();//获取员工列表

        return new PageResult(total,records);
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, long id) {
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
                .build();
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工记录
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        return employee;
    }

    /**
     * 更新员工信息
     * @param employee
     */
    @Override
    public void updateEmpoyee(Employee employee) {
        employeeMapper.update(employee);
    }

    /**
     *
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        //封装到employee对象
        BeanUtils.copyProperties(employeeDTO,employee);
        //设置更新时间，更新作者
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }
    /**
     * 修改员工密码接口
     */
    @Override
    public void editPassword(PasswordEditDTO passwordEditDTO) {
        //使用ThreadLoacal获取当前用户id
        Long currentId = BaseContext.getCurrentId();
        Employee employee = employeeMapper.getById(currentId);
        //对新密码进行MD5加密
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());
        //判断新旧密码是否相等
        if (employee.getPassword().equals(oldPassword)){
            //对新密码进行MD5加密
            String newPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes());
            //更改密码
            employeeMapper.editPassword(newPassword,currentId);
        }else{
            //抛出密码修改失败异常
            throw new PasswordErrorException(MessageConstant.PASSWORD_EDIT_FAILED);
        }
    }


}
